JPH1060731A - Spinneret for producing optically functional, odd-shaped sectional fiber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spinneret that enables efficient production of odd-shaped sectional fiber realizing multi optical functions. SOLUTION: This spinneret for sea-island formation comprises island parts which are a core member for odd-shaped sectional fiber of sea island type capable of developing optical functions, a sea part surrounding the island parts, a polymer conduit assembly in which a number of polymer conduits 106 having fine path through which molten polymer forming the island parts flows are continually arranged, and a partitioning vessel 108 for island flow path control arranged so as to surround the polymer conduit assembly in such a way that each conduit end of the polymer conduits 106 in contact with a spinneret base is open-ended and that the shape of the partitioning vessel 108 for island flow path control can be freely designed for arbitrary installation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spinneret for producing a fiber exhibiting a novel optical function, and more particularly to a spinneret having a function of reflecting ultraviolet light and infrared light, and reflecting, interfering or diffracting visible light. The present invention relates to a spinneret for producing an optically-functional shaped cross-section fiber for forming an island portion constituting the above-mentioned sea-island type fiber by joining with a sea member, particularly when spinning a sea-island type fiber having an optical function of coloring by scattering or the like.

[0002]

2. Description of the Related Art In recent years, in response to a demand for a high texture of fabrics, many sensible fibers have been produced from a simple round fiber having an irregular cross section to improve various physical properties such as gloss and feel. In general, such a fiber production method cannot often be performed by a single component fiber, and is produced by melt spinning comprising two or more types of polymer components, and is used as a spinneret when spinning. A nozzle having an irregular shape is used. In addition, there are many ideas for the irregular shape of the nozzle, the route design until the molten polymer reaches the irregular nozzle, and the design of the discharge port.

[0003] For example, Japanese Patent Publication No. 44-13208 discloses a composite polymer array spinning apparatus in which one component is discharged from a thin polymer conduit (a part corresponding to an island portion).
Other components are described for composite spinning using a porous material provided around the polymer conduit to discharge from a central die through a porous site (corresponding to a sea portion) to form a composite stream.

A feature of this case is that a porous material is used for the other component discharge mouthpiece. Further, the cross section of the formed fiber has a form in which a large number of islands from the polymer fine conduit are dispersed in the sea due to other components, and it is expected that the fiber gloss has improved texture gloss and mechanical function.

Japanese Patent Publication No. 46-3816 and Japanese Patent Publication No. 62-25766 also relate to the production of sea-island type multicomponent fibers having an irregular cross section. In the former design base, a part of the polymer capillary forming the island portion is opened, and a part of the polymer forming the sea portion flows into the narrow portion to form a sea-island cross-section while keeping both components layered. The latter also relates to sea-island type fiber molding,
In particular, the cross-sectional shape of the island component is characterized by being wedge-shaped, cross-shaped, and flat-shaped, and the number of polymer narrow conduits is to prevent a decrease in fluid pressure of other components flowing between the tubes and to reduce discharge unevenness. Therefore, it is said that the smaller the better, the number is 7 in this patent.

Further, Japanese Patent Application Laid-Open No. Hei 5-25705 discloses a die design for eliminating the joining or collision of a plurality of kneading composite streams and obtaining a laminated and laminated structure uniform in the longitudinal direction of the fiber. Regarding the number and arrangement of the spinning holes provided in the spinneret, a disc-shaped spinneret having a plurality of concentric rows of about 300 to 2500 holes is considered to be good.

In any case, these modified cross-section conjugate fibers are used to improve the texture and mechanical properties such as the touch, and to provide a fiber having a complicated cross-section having an optical dimension to exhibit an optical function. It cannot be formed.

Here, a part of a conventional spinneret will be described with reference to FIGS. 9 and 10. FIG. FIG. 9 shows an island-dispersed fiber molding die.
Pass through a polymer conduit 204 held by an upper base 201 and a middle base 202. At the same time, the molten polymer D for forming a sea part fills a space between the upper base 201 and the middle base 202 through a path 206 formed in the upper base 201. In this case, the middle die 202 is made of a porous holding material, and is pushed out to the discharge hole 209 together with the island-forming polymer by being pushed out to the collecting die funnel 203 on average. In the drawing, reference numeral 200 denotes a head outer wall holding each base, and 20 denotes a head outer wall.
Reference numeral 5 denotes a partition wall for C and D, and reference numerals 207 and 208 denote packings.

In order to deform the island, the shape of the discharge hole of the polymer conduit 204 or the discharge hole of the collecting die funnel is changed to thereby deform the island. In this method, the island portion can be deformed, but since the polymer conduit portion has a simple shape, it cannot be deformed to obtain optical characteristics.

The example of the conventional spinneret shown in FIG. 10 is almost the same. The island forming molten polymer E enters the conduit 303 through the distribution plate 309 equipped with the filter. The molten polymer F for forming the sea part passes through the passage 301 and the upper plate 3
02 and the lower plate 305, and the spinning solution introduction hole 304
From the discharge hole 306 to the funnel-shaped portion 307 of the spinneret plate 310 without being mixed, and is discharged from the discharge hole 308 while being throttled. Reference numeral 300 denotes a head outer wall that holds each base.

In this case, although the shape of the island portion can be slightly changed, this is a method of improving stretchability when a brittle amorphous polymer is used for the island portion. And dimensions are not possible.

On the other hand, the present age is said to be a sensible society that will lead to an intellectual society in the near future, and there is a high demand for a high quality material texture for consumer goods. In the field of textiles, as described above, there is a demand for functional fibers which are not limited to the improvement of texture as described above. For example, if it is possible to realize a color that gives an unprecedented appearance, a function of reflecting ultraviolet light that causes deterioration of the material, or a function of reflecting infrared light that is a heat retaining function without performing various treatments on the fiber material, Although it is an extremely useful fiber, it cannot be obtained by the conventional modified fiber molding method, particularly the spinneret.

For this reason, in forming fibers having an irregular cross section, the design of a spinneret for controlling the shape of the polymer to be discharged and the method of using the spinneret are extremely important. In order to obtain the above-mentioned optical function, it is necessary that the deformed shape of the fiber cross section has a predetermined optical dimension. However, the deformed shape having such an optical dimension is extremely complicated, and the ultimate deformed shape and technology It is said that.

The applicant of the present invention has invented a fiber having a cross section of a heterogeneous material and having a color formed by the reflection of ultraviolet and infrared rays and the reflection of visible light. As disclosed in Japanese Patent No. 017349, FIG. 11 shows an example of a deformed portion of a fiber having a deformed cross section having an optical dimension necessary for realizing such coloration, and the characteristics of its reflection spectrum will be described with reference to FIG.

FIG. 11 shows a case where the constituent material of the sea part is an air layer. Let the refractive index of the material of the convex wing 1101 be n
b, the vertical thickness of the air layer between the convex wings 1101 is d.
a, when the thickness in the vertical direction of the convex wing portion 1101 is db, it is desirable to satisfy the following expression. 1.2 ≦ nb ≦ 1.8 0.02μm ≦ da ≦ 0.4μm 0.02μm ≦ db

When the length of the convex wing portion 1101 is Ws, and the width of the slit orthogonal thereto is Wr, 3Wr ≦
It is desirable to satisfy Ws. On the other hand, assuming that the refractive index of the material constituting the sea part is na, when used in a sea-island structure, nb / na is preferably in the range of 1.2 to 1.8 described above, and more preferably closer to 1.8. . One of the reasons is that the desired reflection characteristics can be obtained with a small number of layers, and the manufacturing is easy.

FIG. 12 shows the light reflection function (the relationship between the reflectance and the wavelength) in the shape of only the island portion having the irregular cross section.
(A) shows that the number of the convex wing portions 1101 in FIG.
FIG. 12B shows the state of the reflectance with respect to the wavelength when a = 0.35 μm and db = 0.15 μm, and FIG.
And da and db of the convex wings on the incident light side are seven
Are 0.13 μm and 0.06 μm, respectively, and other convex wings 1101
(A) and (b) show the light reflection function of the modified cross-section fiber having dimensions of about 0.09 μm and 0.05 μm, respectively.

In this case, the refractive index nb of the convex wing molded polymer material is 1.5. As can be seen from this, the convex wing 11
This is a molding of an irregular cross section which reflects ultraviolet rays, infrared rays, and visible light rays for coloring by the dimensions of 01 and its surroundings, for example, a sea area or an air layer, and can exhibit a predetermined or desired optical function, but is extremely difficult.

Examples of materials to be applied to the molding of the fiber having a modified cross section include polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate and polytetramethylene terephthalate, and polystyrene, polycarbonate, polyfluoroethylene and polyacetal. And a common melt thermoplastic polymer such as polyphenylene sulfide. Two or more copolymer polymers and mixed polymers can be used at a common melting temperature of each material.

Further, in order to realize the optical function, two kinds of the above-mentioned materials are selected, and a thin-film sea-island structure of two substances having a predetermined dimension is selected, or one kind is selected. It is necessary to form a sea-island structure of two substances (in this case, air and a polymer) having a predetermined dimension only by the island part in the sea part or the like as an air layer.

[0021]

However, in the case of realizing a modified cross-section fiber satisfying such conditions in a conventional melt spinning method, it is usually necessary to design a path in a head for controlling the flow state of the molten polymer or to use a die. Shape design is considered to be extremely complicated and difficult, and there has been no example realized so far.

An object of the present invention is to provide a spinneret capable of efficiently producing a modified cross-section fiber realizing such a multi-purpose optical function.

[0023]

According to a first aspect of the present invention, there is provided a spinneret for producing a fiber having a modified cross section having an optical function, the island having a core of a sea-island type modified cross section fiber having an optical function. In the spinneret for sea-island molding consisting of the sea part surrounding the periphery of the island part, there are a number of polymer conduits installed on the base for forming the island part and having minute flow paths through which the molten polymer forming the island part flows. A polymer conduit forest that is continuously arranged, and an island channel control partition wall device that is installed so as to surround the polymer conduit forest, wherein the polymer conduit is a conduit connected to the base. The mouth is open.

In the spinneret for producing an optically-functional irregular-section fiber according to a second aspect of the present invention, the shape of the opening formed by the island-part flow-path controlling partition wall is a plurality of parallel slit-shaped openings. There is something.

According to a third aspect of the present invention, in the spinneret for producing an optically-functional deformed cross-section fiber, the opening formed by the island channel control partition has a plurality of first slits arranged in parallel. And a plurality of second slit-shaped openings orthogonal to the plurality of first slit-shaped openings.

According to a fourth aspect of the present invention, in the spinneret for producing an optically-functional irregular-section fiber, the opening formed by the island-portion-controlling partition wall has a plurality of first slits arranged in parallel. When one unit is formed by combining a shape opening and a plurality of second slit-type openings orthogonal to the plurality of first slit-type openings, a shape in which a plurality of units are continuous, or a plurality of units are formed as a pedestal. It has a continuous thin part and a thicker part on the island part of the core material.

According to a fifth aspect of the present invention, there is provided a spinneret for producing an optically-functional irregular-section fiber, wherein a plurality of first slits are formed in parallel with each other in the shape of the opening formed by the island portion flow path controlling partition. When the length of the opening is Ws and the slit width of the second slit-shaped opening orthogonal to the first slit-shaped opening is Wr, 3Wr ≦ Ws is satisfied.

[0028] In the spinneret for producing an optically-functional irregular-section fiber according to claim 6, the height of the island-portion-controlling partition wall is equal to the length of an adjacent polymer conduit or the length of the polymer conduit. It is longer.

Further, in the spinneret for producing an optically-functional irregular-section fiber according to claim 7, the length of the polymer conduit provided in the spinneret is the same.

Further, the spinneret for producing an optically-functional deformed cross-section fiber according to claim 8 is characterized in that the length of the polymer conduit installed on the spinneret pedestal is gradually increased from the outside of the spinneret toward the center. Is what you do.

According to a ninth aspect of the present invention, in the spinneret for producing an optically-functional deformed section fiber, the diameter of the polymer conduit installed on the spinneret pedestal increases as the distance from the second slit-shaped opening increases. The installation pitch of the polymer conduit decreases as the distance from the second slit-shaped opening increases.

According to a tenth aspect of the present invention, there is provided a spinneret for producing an optically-functional cross-section fiber, wherein the polymer conduits installed on the spinneret base form a plurality of parallel rows and a row orthogonal to the plurality of rows. The inner diameter of the plurality of parallel rows of polymer conduits increases from the center of the row toward the distal end of the polymer conduits and / or the placement pitch of the polymer conduits decreases.

[0033]

According to the present invention, a spinneret for producing an optically-functional deformed cross-section fiber (Claim 1) is characterized in that a plurality of polymer conduits having minute flow paths through which a molten polymer forming an island portion flows are connected to a conduit connected to the base of the die. Since the mouth is open, the polymer conduit is provided with a polymer conduit forest that is continuously arranged, and an island channel control partition wall device that is installed so as to surround the polymer conduit forest, The molten polymer for forming the island portion is discharged only from the polymer conduit and flows out while filling the inside of the partition wall for controlling the island portion flow path. Further, the molten polymer for forming the sea part is discharged so as to fill the outside of the partition wall for controlling the island flow path, and the molten polymer for forming the island part and the molten polymer for forming the sea part are formed at the outlet opening of the partition wall for controlling the island part flow path. Since both polymers are joined to form an island, there is an effect that the transferability of the island shape is improved.

The spinneret for producing an optically-functional irregular-section fiber according to the present invention (claim 2) is a slit-shaped opening formed by a plurality of parallelly arranged slits formed by the island-part flow-path controlling partition wall. In some cases, irregular cross-section fibers embodying multiple optical functions are ejected.

The spinneret for producing an optically-functional cross-section fiber according to the present invention (claim 2) is characterized in that the opening formed by the island channel control partition has a plurality of first slits arranged in parallel. Due to the combined shape of the shaped openings and the second slit-shaped openings orthogonal to the plurality of first slit-shaped openings, irregularly shaped fibers realizing a multi-purpose optical function are discharged.

[0036] The spinneret for producing an optically-functional deformed section fiber according to the present invention (claim 3) is characterized in that the opening formed by the island part flow path controlling partition has a plurality of first slits arranged in parallel. When one unit is formed by combining a shape opening and a plurality of second slit-type openings orthogonal to the plurality of first slit-type openings, a shape in which a plurality of units are continuous, or a plurality of units are formed as a pedestal. By having a continuous thin portion and a thicker portion on the island portion of the core material, irregular shaped fibers realizing a multi-purpose optical function are discharged.

The spinneret for producing an optically-functional irregular-section fiber according to the present invention (claim 4) has a plurality of first slit-shaped slits formed in parallel with each other in the shape of the opening formed by the partition wall for controlling the island flow path. Let the length of the opening be Ws, and let the slit width of the second slit opening orthogonal to the first slit opening be Ws
When r is satisfied, by satisfying 3Wr ≦ Ws, a fiber having a modified cross section realizing a multi-purpose optical function is discharged.

In the spinneret for producing an optically-functional deformed section fiber according to the present invention (claim 5), the height of the island-portion-controlling partition wall is equal to the length of the adjacent polymer conduit or the length of the polymer conduit. In particular, when the molten polymer for forming the sea portion is used, the contact between the molten polymer for forming the island portion and the molten polymer for forming the sea portion is slightly delayed, and the shape maintaining property of the molten polymer for forming the island portion (transfer). Sex) is increased.

In the spinneret for producing an optically-functional deformed section fiber according to the present invention (claim 6), the molten polymer for forming the island portion is in contact with each other because the length of the polymer conduit provided in the spinneret is the same. It becomes difficult to do.

In the spinneret for producing an optically-functional cross-section fiber according to the present invention (claim 7), the length of the polymer conduit provided on the spinneret pedestal is inclinedly increased from the outside of the spinneret toward the center. As a result, the contact between the molten polymer for forming the island portion and the molten polymer for forming the sea portion can be delayed while minimizing the disturbance of the discharge flow of the outer polymer conduit, and the shape maintenance (transferability) of the molten polymer for forming the island portion can be performed. Can be enhanced.

In the spinneret for producing an optically-functional irregular-section fiber according to the present invention (claim 8), the diameter of the polymer conduit installed on the spinneret base increases as the distance from the second slit-shaped opening increases. By setting the pitch of the polymer conduits smaller as the distance from the second slit-shaped opening increases, for example, by increasing the pipe diameter of the polymer conduit toward the tip or by increasing the pitch of the polymer conduit, the polymer supply amount can be balanced. And spinning can be performed more accurately.

The spinneret for producing an optically-functional deformed section fiber according to the present invention (claim 9) is such that the polymer conduits installed on the spinneret pedestal form a plurality of parallel rows and a row orthogonal to the plurality of rows. The inner diameter of the plurality of parallel rows of polymer conduits is increased from the center of the row toward the polymer conduit at the tip and / or the pitch of the polymer conduits is reduced, thereby reducing the polymer feed rate. The balance is maintained and spinning can be performed more accurately.

[0043]

Hereinafter, a spinneret for producing an optically-functional irregular-section fiber according to the present invention will be described.
[Embodiment 1], [Embodiment 2], and [Embodiment 3] will be described in detail with reference to the drawings.

[Outline of Spinneret of the Present Invention] With reference to FIG. 1, the outline of the spinneret for producing an optically-functional cross-section fiber of the present invention will be described. FIG. 1 is a view of the island forming die, which is a point of the present invention, viewed from the polymer discharge port. In fiber molding or the like having an irregular cross section, first, flow paths of two kinds of molten polymers having different physical properties forming an island portion, a sea portion, and the like are individually secured until reaching a predetermined junction.

A large number of conduits 106 of a predetermined length which allow a small amount of the molten polymer for forming the island portion to flow downstream are continuously buried in the base for forming the island portion. The molten polymer for the application does not come into contact with each other.

On the other hand, a partition wall 108 for controlling an island flow path which is designed to have a predetermined irregular cross section is installed in a portion of the conduit forest, and the molten polymer for forming the island portion is provided with the partition wall 108. Is discharged only from the conduit 106 inside the enclosed portion, and the island portion is formed by joining only the flow from the conduit within the partition portion for controlling the island portion flow path, thereby improving the transferability of the island portion shape. effective.

If the molten polymer for forming the sea part is used at the same time, a sea-island structure is obtained, and if not used, a sea-shaped part having only the island part of the air layer can be obtained. Furthermore, the height of the partition wall depends on the length of the conduit, and if the height is almost the same or slightly higher, when the molten polymer for forming the sea part is used, in particular, the contact between the molten polymer for forming the island part and the molten polymer for forming the sea part is slight. This has an effect on delayed shape maintenance (transferability).

The tube diameter and the installation pitch of the polymer conduit are usually the same tube diameter and the same pitch in view of the production cost of the spinneret, but a slit-shaped opening orthogonal to a plurality of parallel slit-shaped openings is provided. In the case of a combined irregular cross-sectional shape, the amount of polymer supplied to the tip of the convex wing may be smaller than that of the orthogonal part, so as shown in FIG. 2, the diameter of the polymer conduit is increased toward the tip, Alternatively, as shown in FIG. 3, the supply amount to the orthogonal opening and the supply amount to the parallel slit opening are balanced by increasing the installation pitch toward the tip.

Further, the applicant has disclosed in Japanese Patent Application Laid-Open No.
The irregular cross-sectional shape for providing the optical function disclosed in Japanese Patent No. 7349 is preferably a shape in which a plurality of parallel slit-shaped openings are combined with a slit opening orthogonal to the slit. When the slit width of the opening is Wr, when 3Wr ≦ Ws, an optical function is strongly exhibited.

As described above, the fiber having the optical function needs to keep a predetermined shape properly, but the fine and plural parallel slits are properly separated to maintain the shape. This is a very important point in the process from the molten polymer to the fiberization.

Therefore, the spinneret according to the present invention is composed of a number of polymer conduits 106 installed at the site where the molten polymer is discharged from the island as the core material, and an island channel control partition 108 surrounding the periphery thereof. This ensures that the molten polymer of the marine material surrounding the periphery of the island part properly fills the concave part forming the island part, and the final spinning discharge hole is in a state similar to the designed shape. It is devised to be led to.

It is easier for machining to make the lengths of the polymer conduits all the same, but the length of the polymer conduit depends on the shape of the gathering concave portion of the molten polymer for forming the sea-island and has a funnel-shaped slope. By making the length close to the vicinity of the starting portion, the contact time between the island-forming molten polymers can be extended as much as possible, and at the same time, the influence of the compression from the funnel-shaped wall surface can be reduced as much as possible. Further, the length of the conduit located at the outer periphery of the conduit forest is the above-mentioned length, and it is more effective to temporarily increase the length toward the center.

Further, the shape of the final throttle discharge hole 107 of the spinneret for producing the optically-functional deformed cross-section fiber of the present invention is usually a round shape. For example, when there is a comb-like longitudinal direction and a short direction, the ejection hole shape is narrow in the longitudinal direction and long in the short direction. An irregular shape having a predetermined or desired aspect ratio, which is different from the shape and the aspect ratio of the opening formed by the flow path control partitioning device 108, can be obtained.

Example 1 FIG. 4 is a schematic view of a spinning apparatus using a spinneret for producing an optically-functional cross-section fiber of Example 1, wherein A is a molten polymer for spinning forming a sea part (sea part formation). Flow channel 1 surrounded by the middle base 105
Pass through 03. B is a molten polymer that forms an island portion (island-forming molten polymer), passes through a flow path 104 in a middle die 105 that is isolated from a flow path of the molten polymer A for spinning, and further has a polymer conduit 106. Central base 1 integrated with
Go through 05. Thereafter, the spinning molten polymer A and the molten polymer B are simultaneously fed to the lower die 102 having a funnel-shaped assembly.
And is discharged from the discharge hole 107 while being squeezed.

FIG. 5 shows an example of the parts of the polymer conduit 106 and the peripheral portion. FIG. 5A shows an example of the middle base 105 which is a distribution plate of the molten polymer B. Thereby, the molten polymer B flows uniformly into the polymer conduit 106 with a lower pressure loss. FIG. 5C shows the central base 10.
5 is an example of a longitudinal section of the polymer conduit buried in No. 5 (in the first embodiment, the inner diameter is 0.3 mm), and in this case, the conduit and the central partition wall of the conduit, that is, the pitch is about 1.0 mm.

The length of the conduit is as long as possible (8 mm in the first embodiment), and the vicinity of the upper part of the concave portion (dotted line portion 107a in FIG. 4) of the funnel-shaped collecting portion is minimized while avoiding contact with the marine polymer. I've been there. However, it is important that the length of the sea-portion-forming polymer be set to such a length as to minimize disturbance of the discharge flow, particularly of the outer peripheral conduit, depending on the discharge flow velocity of the sea-forming polymer used. Further, as shown in FIG. 5D, the length may be increased toward the center, but in Example 1, the length was uniformly set to 8 mm. (Note that in FIGS. 4 and 5, illustration of the island portion flow path control partition is omitted to avoid complicating the drawings.)

FIG. 6 shows an example of an island channel control partition wall device to be fitted into a conduit forest (in the first embodiment, a convex wing portion as shown in FIG. ), The number of convex wings is 5), and the height is the length of the polymer conduit 106 plus 1 mm. in this way,
By fabricating the basic die as shown in FIG. 5 and the various deformed bulkheads as shown in FIG. 6, it is possible to obtain a deformed fiber having a large number of optical dimensions.

FIG. 7 shows a polystyrene-based (PS-based) polymer used as the sea-forming polymer and a polycarbonate-based (PC-based)
FIG. 7 is a cross-sectional view of one lamellar type irregular shape (FIG. 7 (a): same lamellar length, FIG. 7 (b): lamellar length change) of an island portion of a fiber obtained by spinning using (system). Here, when the optical function of the fiber of FIG. 7A was measured, the optical function as shown in FIG. That is, according to the first embodiment, it is possible to provide a spinneret capable of efficiently producing a modified cross-section fiber realizing a multi-purpose optical function.

As described above, according to the first embodiment, the fiber obtained from the shape of the opening particularly by using the partition wall for controlling the island part flow path has a shape capable of exhibiting the intended optical function of the present fiber. A properly maintained fiber can be obtained, which greatly contributes to the quality and productivity at the time of producing such a fiber.

[Embodiment 2] In the second embodiment, in place of the modified partition wall for controlling the polymer flow channel of the first embodiment, a modified partition wall device for controlling the polymer flow channel having another shape is used.

In Embodiment 2, as shown in FIG. 2, the convex wing lengths of the island portion flow control walls are all the same, and the inner diameter of the polymer conduit is 0.65 mm at the orthogonal portion and 1.5 mm at the tip portion. The spinning was performed using the same spinneret as in Example 1 except that the amount was gradually increased. The lamellar type irregular cross section of the island portion of the obtained fiber is shown in FIG.
The degree of irregular transfer was equal to or better than (a). That is, according to the second embodiment, it is possible to provide a spinneret capable of efficiently producing irregular-shaped cross-section fibers realizing multiple optical functions.

[Embodiment 3] The same package head as in Embodiments 1 and 2 was used, and an island part flow path controlling partition wall unit 108 was used as shown in FIGS. 8 (a) and 8 (b). In the hatched portion in the figure, the conduit of the molten polymer for forming the island portion is located. FIG. 8 (b) shows a partition wall container having a plurality of parallel slits having different lengths and designed to be connected to a portion serving as a thick base. As described above, even when the length and width were the same, good transferability was obtained even in a combination of an extremely narrow slit width and a wide slit width.

[0063]

According to the present invention, there is provided a spinneret for producing an optically-functional deformed fiber (claim 1), comprising: an island which is a core material of a sea-island-shaped irregularly-shaped fiber exhibiting an optical function; and a sea portion surrounding the island. In the spinneret for sea-island molding consisting of: a large number of polymer conduits having a micro flow path, which is installed on a base for forming an island portion and through which a molten polymer forming an island portion flows, are continuously arranged. A polymer conduit forest; and an island channel control partition wall device installed so as to surround the polymer conduit forest. The polymer conduit has an open conduit opening at a portion connected to the base. The molten polymer for forming the part is discharged only from the polymer conduit, and flows out while filling the inside of the island part flow path control partition. Further, the molten polymer for forming the sea part is discharged so as to fill the outside of the partition for controlling the island flow path, and the molten polymer for forming the island and the molten polymer for forming the sea part are discharged at the outlet opening of the partition for controlling the island flow path. The two polymers are joined to form an island, so that the transfer of the island shape is improved. Therefore, fibers with irregular cross sections realizing multiple optical functions can be efficiently produced.

The spinneret for producing an optically-functional cross-section fiber according to the present invention (claim 2) is characterized in that the opening formed by the island part flow path controlling partition has a plurality of first slits arranged in parallel. Since the shaped opening and the second slit-shaped openings orthogonal to the plurality of first slit-shaped openings are combined, it is possible to efficiently produce a modified cross-section fiber that realizes a multi-purpose optical function.

The spinneret for producing an optically-functional irregular-section fiber according to the present invention (claim 3) is characterized in that the opening formed by the island-part flow-path controlling partition has a plurality of first slits arranged in parallel. When one unit is formed by combining a shape opening and a plurality of second slit-type openings orthogonal to the plurality of first slit-type openings, a shape in which a plurality of units are continuous, or a plurality of units are formed as a pedestal. Since there are a continuous thin portion and a thicker portion on the island portion of the core material, a modified cross-section fiber realizing a multi-purpose optical function can be efficiently produced.

The spinneret for producing an optically-functional modified cross-section fiber according to the present invention (claim 4) has a plurality of first slits formed in parallel with each other in the shape of the opening formed by the island part flow path controlling partition. Let the length of the opening be Ws, and let the slit width of the second slit opening orthogonal to the first slit opening be Ws
Since r satisfies 3Wr ≦ Ws, it is possible to efficiently produce a fiber having a modified cross-section realizing a multi-purpose optical function.

In the spinneret for producing an optically-functional deformed cross-section fiber according to the present invention (claim 5), the height of the island portion flow path controlling partition wall is equal to the length of the adjacent polymer conduit or the length of the polymer conduit. In particular, when the molten polymer for forming the sea part is used, the contact between the molten polymer for forming the island part and the molten polymer for forming the sea part is slightly delayed, and the shape maintenance property of the molten polymer for forming the island part (transferability) ) Increased,
It is possible to efficiently produce a fiber having an irregular cross section that realizes a multi-purpose optical function.

In the spinneret for producing an optically-functional deformed cross-section fiber according to the present invention (claim 6), the lengths of the polymer conduits provided in the spinneret are the same, so that the island-forming polymers can easily come into contact with each other. In other words, it is possible to efficiently produce a fiber having a modified cross section that realizes a multi-purpose optical function.

In the spinneret for producing an optically-functional cross-section fiber according to the present invention (claim 7), the length of the polymer conduit installed on the spinneret pedestal is inclined from the outside to the center of the spinneret. The contact between the molten polymer for forming the island portion and the molten polymer for forming the sea portion can be delayed while minimizing the disturbance of the discharge flow of the outer polymer conduit, and the shape maintaining property (transferability) of the molten polymer for forming the island portion can be improved. As a result, it is possible to efficiently produce a modified cross-section fiber that realizes multiple optical functions.

The spinneret for producing a fiber having an optically deformed cross section according to the present invention (claim 8) has the same diameter and the same pitch as the polymer conduits installed on the spinneret pedestal. Manufacturing cost can be reduced. When the pipe diameter and the installation pitch are not the same and are installed, for example, the polymer supply amount is balanced by increasing the pipe diameter of the polymer conduit toward the tip or making the installation pitch dense. Spinning can be performed more accurately. Therefore, fibers with irregular cross sections realizing multiple optical functions can be efficiently produced.

The spinneret for producing an optically-functional deformed section fiber according to the present invention (claim 9) is such that the polymer conduits installed on the spinneret base form a plurality of parallel rows and a row orthogonal to the plurality of rows. The inner diameter of the polymer conduits in a plurality of parallel rows increases from the center of the row toward the polymer conduit at the tip, or the pitch of the polymer conduits decreases, so that the polymer supply amount is balanced. And spinning can be performed with higher precision. Therefore, fibers with irregular cross sections realizing multiple optical functions can be efficiently produced.

[Brief description of the drawings]

FIG. 1 is an explanatory view schematically showing a spinneret for producing a fiber having a modified optical function cross section according to the present invention.

FIG. 2 is an explanatory view showing an example of setting a polymer conduit of a middle spinneret for forming an island portion.

FIG. 3 is an explanatory view showing an example of setting a polymer conduit of a middle spinneret for forming an island portion.

FIG. 4 is a schematic view of a spinning apparatus using a spinneret for producing an optically-functional irregular-section fiber.

FIG. 5 is an explanatory view showing an example of parts of a polymer conduit and peripheral parts.

FIG. 6 is an explanatory diagram showing an example of a partition wall device for controlling an island flow path to be fitted into a conduit forest.

FIG. 7 is a cross-sectional view of one lamellar variant of an island portion of a fiber obtained by spinning when a polyethylene-terephthalate-based polymer is used for a sea-forming polymer and a polycarbonate-based island is used.

FIG. 8 is an explanatory diagram showing an example of a flow path controlling partition wall device (a hatched portion is a flow path of a molten polymer for forming an island portion).

FIG. 9 is an explanatory view showing a part of a conventional spinneret.

FIG. 10 is an explanatory view showing a part of a conventional spinneret.

11A and 11B are a perspective view and a cross-sectional view of an island portion in which fibers having an irregular cross section are formed.

FIG. 12 is an explanatory diagram showing a reflection spectrum associated with a deformed portion configuration.

[Explanation of symbols]

A, D, F Molten polymer for forming sea part (molten polymer for spinning) B, C, E Molten polymer for forming island part (molten polymer) 101 Package head 102 Funnel-shaped polymer collecting die 103 Molten polymer flow path for forming sea part 104 molten polymer flow path for island formation 105 middle base 106 polymer conduit 107 compression discharge hole 108 partition wall control for island flow path

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Akio Sakihara 26 Suzukawa, Isehara-shi, Kanagawa Prefecture Inside the Isehara Plant of Tanaka Kikinzoku Kogyo Co., Ltd. (72) Inventor Kinya Kumazawa 2 Takaracho, Kanagawa-ku, Yokohama, Kanagawa Prefecture Nissan Motor Co., Ltd.

Claims (10)

[Claims] 1. A spinneret for forming a sea-island comprising an island which is a core material of a sea-island type irregular cross-section fiber exhibiting an optical function and a sea surrounding the periphery of the island, wherein a base for forming the island is provided. A polymer conduit forest in which a plurality of polymer conduits having a small flow path through which a molten polymer forming an island flows are disposed in a continuous manner, and an island conduit disposed so as to surround the polymer conduit forest. With a control bulkhead,
A spinneret for producing an optically-functional irregular-section fiber, wherein a conduit port of the polymer conduit connected to the base is opened. 2. The optically-functional cross-section fiber according to claim 1, wherein the shape of the opening formed by the island-part flow path controlling partition wall is a plurality of parallel slit-shaped openings. Spinneret for manufacturing. 3. The shape of the opening formed by the island part flow path controlling partition wall is orthogonal to the plurality of first slit-shaped openings arranged in parallel and the plurality of first slit-shaped openings. 3. The spinneret according to claim 1, wherein the second slit-shaped openings have a combined shape. 4. The shape of the opening formed by the island flow path controlling partition wall is orthogonal to the plurality of first slit-shaped openings arranged in parallel and the plurality of first slit-shaped openings. When the shape obtained by combining the second slit-shaped openings is one unit, a plurality of units are continuously formed, or a plurality of units are continuously formed on an island portion of a core material serving as a pedestal, and a thin portion and a thicker portion are formed. The spinneret for producing an optically-functional cross-section fiber according to claim 1, wherein the spinneret has a portion. 5. In the shape of the opening formed by the island portion flow path controlling partition wall, the length of the plurality of first slit-shaped openings arranged in parallel is Ws, and the length of the first slit-shaped opening is 5. The spinneret according to claim 3, wherein 3Wr ≦ Ws is satisfied when the slit width of the second orthogonal slit opening is Wr. 6. The method according to claim 1, wherein the height of the partition wall for controlling the island portion flow passage is equal to or longer than the length of the adjacent polymer conduit.
6. A spinneret according to claim 3, 4 or 5, for producing a fiber having an irregularly shaped optical function. 7. The length of a polymer conduit installed in the spinneret is the same.
7. The spinneret according to 3, 4, 5 or 6, for producing a fiber having an irregularly shaped optical function. 8. The spinneret according to claim 1, wherein the length of the polymer conduit installed on the spinneret pedestal is gradually increased from the outside of the spinneret toward the center.
7. The spinneret according to 4, 5, or 6, for producing a fiber having an irregularly shaped optical function. 9. The pipe diameter of the polymer conduit installed on the spinneret base increases as the distance from the second slit-shaped opening increases, or as the installation pitch of the polymer conduit increases from the second slit-type opening. The spinneret according to claim 1, 3, 4, 5, 6, 7, or 8, wherein the spinneret is used for producing a fiber having an irregularly shaped optical function. 10. The polymer conduits mounted on the spinneret pedestal are arranged so as to form a plurality of parallel rows and a row orthogonal to the plurality of rows, wherein the plurality of parallel rows of polymer conduits have an inner diameter. 4. The method according to claim 1, wherein the pitch increases from the center of the row to the polymer conduit at the tip and / or the pitch of the polymer conduit decreases.
The spinneret for producing an optically-functional irregular-section fiber according to 4, 5, 6, 7, or 8.